package com.wxy.demo.aba;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicStampedReference;

public class Demo {
    static AtomicStampedReference<Integer> atomicStampedReference = new AtomicStampedReference<>(100, 1);

    public static void main(String[] args) {
        System.out.println("======ABA问题的解决======");
        new Thread(() -> {
            int stamp = atomicStampedReference.getStamp();
            System.out.println(Thread.currentThread().getName() + "第一次版本号： " + stamp);
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            atomicStampedReference.compareAndSet(100, 101,
                    atomicStampedReference.getStamp(), atomicStampedReference.getStamp() + 1);
            System.out.println(Thread.currentThread().getName() + "第二次版本号： " + atomicStampedReference.getStamp());
            atomicStampedReference.compareAndSet(101, 100,
                    atomicStampedReference.getStamp(), atomicStampedReference.getStamp() + 1);
            System.out.println(Thread.currentThread().getName() + "第三次版本号： " + atomicStampedReference.getStamp());
        }, "t3").start();

        new Thread(() -> {
            int stamp = atomicStampedReference.getStamp();
            System.out.println(Thread.currentThread().getName() + "第一次版本号： " + stamp);
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            boolean result = atomicStampedReference.compareAndSet(100, 2019,
                    stamp, stamp + 1);
            System.out.println(Thread.currentThread().getName() + "修改成功与否：" + result + "  当前最新版本号" + atomicStampedReference.getStamp());
            System.out.println(Thread.currentThread().getName() + "当前实际值：" + atomicStampedReference.getReference());
        }, "t4").start();
    }
}
